Scraping device



T. E. CHERRY SGRAPING DEVICE Julie 6, 1939.

Filed March 4, 1957 Patented June 6,1939 1 Y 2,161,335

g UNITED? STATES PATENT OFFICE SCRAPING DEVICE Thomas E. Cherry, Cambridge, Mass.

Application March 4, 1937, Serial No. 129,046

2 Claims. (Cl. 30-272) 'I'his invention relates to poweractuated scrap- Opposite edge, and the rear margin of the plate ing devices suitable for removing paper, paint I is formed with a groove I6 which is in alignand other coating materials from a wall, ceiling ment with an opening I 8 formed in the outer end or the like surface. of the cap proper, as shown in Fig. 3. The rear The principal objects of the invention are to edge of the plate II is formed with a recess I9 5 provide a scraper device which is of strong and (Figs. 3 and 3a) which provides a discharge opendurable construction and which is reliable and ing communicating with the interior of the nose efficient in operation; to provide a scraper which piece 8 and thIOugh Which SCIaDingS 216011111111315- is so constructed that the actuating mechanism ing within the nose piece may bc discharged- 10 may be adjusted to vary the effective stroke or A scraper blade 20 has a snug sliding fit within 10 oscillatory movement of the' scraper blade or the slot I4 and an arm 2| is riveted or otherwise knife, thus not only permitting a more efcient secured to the rear edge of the blade, as shown operation of the device on different types of surmore clearly in Fig. 3. The arm 2l loosely ts faces but also enhancing its rangev of usefulness; in the groove I6 and extends through the openand to provide a scraper which is so designed ing I8 into the interior of the cap or tubular 15 that particles removed from a wall or other surbody I. A pair of narrow leaf springs 24 are face can not work their Way into the Vicinity of kdisposed in the recess I5 and one end of each of "the actuating mechanism. the springs is bent to provide a lug or ear 25 k Further objects will be apparent from a conwhich snugly fits into a recess form-ed in the sideration of the following description and the lateral margin of the plate I0, as shown in Fig. 20

accompanying drawing, wherein: 2, and their opposite ends loosely t in a corre- Fig. 1 is a side elevation of a scraper consponding opening in the opposite edge, thus prostructed in accordance with the present invenviding an anchoring means which not only holds tion and illustrating one manner of using the the springs in position within the recess I5, but

same; also permits flexing. 25

Fig. 2 is an enlarged top plan View, with parts The fixed end of the arm 2I projects above broken away and shown in section, of the front the upper surface of the blade 20 and provides, end ofthe device shown in Fig. 1; i in effect, an abutment against which the springs Fig. 3 is an enlarged section on the line 3-3 24 normally act to hold the scraper blade and of Fig. 2; arm in the retracted position. The parts are 30 Fig. 3a is a fragmentary bottom plan View, on preferably so constructed and arranged that a reduced scale, of the nose piece; when the scraper blade and arm are in retracted Fig. 4 is a section on the line 4 4 of Fig. 3; position, the springs 24 are slightly bowed and Fig. 5 is an enlarged view, partly in section, the front edge 0f the Scraper blade DIOJ'BCS 011t- 5 of the rear end of the device shown in Fig. 1; and Waldly beyond that 0f the casing, as ShOWIl in 35 Fig. 6 is a View showing amodii'lcation and Figs. 2 and 3. 'Ihe inward movement of the illustrating the use of the device for removing scraper blade and arm is limited by the engagepaper, paint or other coating material from an ment of therear edge of the blade with the end upright wall. f 26 (Fig. 3) of the cap, which constitutes, in ef- ,.0 .The embodiment shown in Figs. 1 to 4 comfeet, a stop limiting the inward movement of 40 prises an elongate tubular body I having at one the scraper blade and arm. end a threaded peripheral flange 3. A cap 5, Mounted within the lower end of the body is having an interiorly threaded wall 6, is carried an oscillating mechanism, herein shown by way by the front end of the body I, and the outer of example, as comprising a plate cam or swash end of this cap is provided with a nose piece 8 plate 30 mounted on or integral with one end 45 to which is rigidly secured a rectangular casing of a stub shaft 3| rotatable in a cylindrical bearconsisting of an upper plate I0, a lower plate II, ing 32, there being a thrust bearing 34 interand beads or spacers I2 provided along the side posed between the bearing 32 and the inner end edges of one of the plates to hold them in spaced or surface of the cam 30. The periphery of the relation so as to provide an elongate narrow slot bearing 32 has a screw-threaded engagement 50 or shallow chamber I4 which extends from the within the bore of the cap 5 and in order to front edge of the casing to its rear edge, as facilitate insertion, removal, and adjustment of shown in Fig. 3. 'Ihe upper plate I0 is formed the bearing 32, its inner end is formed with diawith a recess I5 (Figs. 2 and 3) which extends metrically opposite openings 35 (Fig. 3) to acfrom adjacent one lateral edge to adjacent the commodate a Spanner wrench or the like tool. 55

Cil

' tion of the cam 30 is maintained in engagement are applied to like parts. the motor 4D and handle 48 there is provided a with the end of the arm 2|, and if a shorter stroke is desirable, it is merely necessary to adjust the position of the bearing 32 inwardly, relative to the end of the arm, so that the arm 2| is engaged by the cam 30 only during a part of one revolution.

:Referring to Fig. 5, an electric motor 40 is rigidly secured to the flange 3 of the body I, so that its driving shaft 4I projects into the bore of the body and a coupling 42 is pinned or etherwise secured to the shaft 4I. The inner end` of the coupling is formed with diametrically disposed slots 44 which receive a'pair of pins 45 carried by the end of a driving shaft 46. which extends axially through the body I. The opposite end of the driving shaft 45 is connected to or integral with the stub shaft 3|, as shown in Fig,'3. A handle 48 is attached in any suitable manner to the casing of the motor.

'In the embodiment shown in Fig. 6, vthe tubular body and front end of the device are substantially identical to the previously described embodiment and the sam-e reference numerals However, in place of 4 of the scraper blade may be varied in accordance with the particular type of material being removed. For example, in removing wall paper it maybe desirable for the oscillating mechanism to impart the maximum stroke to the scraper blade, in which case the capY 5 and associated parts are rst removed and the bearing 32 is then adjusted longitudinally so that the end' of the arm engages the dwell portion of the cam 30, as previously explained. But should it be desirable to shorten the stroke, then the bearing 32 may be moved inwardly away from the end ofthe arm 2| until its position is such that the cam 30 causes a looser displacement of the arm 2|-, By reason of thisl adjustment a more efficient operation is possible, and furthermore the device may be used to remove various types of materials which would otherwise be di'icult, if not practically impossible.

It Will be further noted that the nose piece or casing which slidably supports the scraper blade is separate from the housing for the actuating mechanism, and although particles scraped from the wall or other surface may work their way into the casing or nose piece, they are discharged through the opening I9 at the rear and hence can not work their way into the interior of the housing or body where they would tend to clog or impair the operation of the oscillating mechanism.

While I have shown and described one desirable embodiment of the invention, it is to be understood that this disclosure is for the purpose of illustration and that various changes in shape, proportion, and arrangement of parts, as well as the substitution of equivalent elements for those herein shown and described, may be made' without departing from the spirit and' scope of the invention as set forth in the appended claims.

I claim: Y

l, A scraper device comprising a tubular body, a nose' piece rigidly secured to the front end of said body, said nose piece having a slot extending4 from its outer edge inwardly toward said b-:dy andan opening providing a communication between said slot and the interior of' said body, said nose piece also having a discharge opening communicating directly with the inner end of said slot, a scraper` blade mounted in said slot for oscillatory movement,.said scraper blade having an arm extending through said opening into the interior of said body, and actuating means constructed and arrangedy to actuate said arm, thereby to effect the oscillation of said scraper blade and the discharge ofA any particles in said slot through said discharge opening.

2. A scraper device comprising a tubular body, a nose piece rigidly secured to the front end of said' body, said nose piece having. a slot extending from its outer edge inwardly toward said body and an opening providing a communication between said slotl and the'interior of said body, said nose piece having a discharge opening throughv which particles accumulating inA its-interior maybe discharged, a scraper blade mounted in said slot for oscillatory movement,said scraperv blade having an arm extending through saidv opening into the interior of rsaid body, resilient means within said nose piece yieldingly urging said scraper blade inwardly, and oscillatingr meansV disposed within the front end of said body, said oscillating means being engageable with said arm' to Veffect the oscillation of said scraper blade. Y

THOMAS E. CHERRY. 

